Formation Age and Magma Source of the Shazhangtu Diorite Porphyry, Inner Mongolia: Constraints of Petrogeochemistry, Zircon U-Pb Geochronology and Hf Isotopes

doi:10.19657/j.geoscience.1000-8527.2021.147

Abstract

Abstract:

Diorite porphyry has been widely studied due to its genesis and ore-bearing characteristics. Many diorite porphyry intrusions were found in the north of Abagaqi (Inner Mongolia), accompanied by high-background geochemical anomalies. Studies on petrology, zircon U-Pb geochronology, geochemistry and Lu-Hf isotopes have been conducted for the formation age and magma source of diorite porphyry samples from the Shazhangtu mining area in Inner Mongolia. The diorite porphyry was emplaced at (311.1±1.7) Ma, and is the product of the middle Hercynian (Late Carboniferous) tectonomagmatic activities. The rocks have SiO₂=56.19%-60.45%, Na₂O+K₂O=4.81%-5.87%, and aluminum saturation index (A/CNK)=1.00-1.43. It belongs to high potassium calc-alkaline and peraluminous rocks. The LREE LILE (K, Rb) and HFSE (Zr,Th and U) are enriched, and the HFSE (Nb, Ta, P, Hf and Ti) are depleted, indicating that the geochemical characteristics of island are magmatic rocks in subduction zone. The total REE contents ranges from 139.62×10^-6 to 150.67 ×10^-6, showing a right-inclined pattern of light rare earth enrichment and heavy rare earth depletion with weak negtive Eu anomaly. The Hf isotopic data of zircons show that the single-stage and two-stage model ages range from 637 to 905 Ma and from 827 to 1,259 Ma, respectively, and the ε_Hf(t) value of zircons varies from 1.10 to 7.80, indicating the characteristics of mantle-derived magma. It is probably the partial melting magma in the mantle wedge due to the dewatering of the subduction plate that underplated under the bottom of the lithosphere and the molten body rises to cause under-invasion, heated and induced the partial melting of the new formed juvenile basic lower crust, forming the crust-mantle sources mixed magma.

Key words: diorite porphyry, U-Pb geochronology, geochemistry, zircon Hf isotope, Shazhangtu mining area

CLC Number:

LÜ Yunhe, DONG Guochen, ZHAO Liwei, SU Lin, YIN Guodong, TANG Jiahui. Formation Age and Magma Source of the Shazhangtu Diorite Porphyry, Inner Mongolia: Constraints of Petrogeochemistry, Zircon U-Pb Geochronology and Hf Isotopes[J]. Geoscience, 2022, 36(03): 836-847.

Figures/Tables 13

Fig.1 Regional geologic map (a) and geologic map of the Shazhangtu mining area (b) (base map according to reference [11])

Fig.2 Rock hand-specimen and thin-section microscopic photos of the diorite porphyry

Table 1 LA-ICP-MS zircon U-Pb data of the diorite porphyrite in Shazhangtu mining area

分析点	元素含量/10^-6			Th/U	同位素比值				年龄/Ma
分析点	Th	U	Pb	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb/²³⁸U ±1σ
IIML84-01	129.2	273.9	15.2	0.5	0.051 77±0.000 98	0.350 94±0.007 07	0.049 11±0.000 44	305.4±5.3		309.1±2.7
IIML84-02	144.6	315.6	17.5	0.5	0.051 50±0.000 95	0.351 99±0.006 33	0.049 61±0.000 39	306.2±4.8		312.1±2.4
IIML84-03	89.2	235.4	13.0	0.4	0.052 32±0.001 06	0.360 82±0.007 16	0.050 03±0.000 40	312.8±5.3		314.7±2.5
IIML84-04	176.7	435.4	24.1	0.4	0.051 10±0.000 83	0.356 33±0.006 15	0.050 52±0.000 50	309.5±4.6		317.7± 3.1
IIML84-05	61.2	159.6	8.8	0.4	0.051 56±0.001 13	0.357 30±0.007 72	0.050 33±0.000 52	310.2±5.8		316.5±3.2
IIML84-06	117.0	258.2	14.1	0.5	0.053 68±0.001 16	0.364 53±0.008 06	0.049 22±0.000 50	315.6±6.0		309.7±3.1
IIML84-07	93.3	233.7	12.8	0.4	0.052 49±0.001 10	0.363 94±0.007 20	0.050 36±0.000 51	315.2±5.4		316.7±3.1
IIML84-08	167.1	315.5	17.7	0.5	0.052 90±0.000 93	0.361 05±0.006 33	0.049 38±0.000 42	313.0±4.7		310.7±2.6
IIML84-09	122.5	313.0	16.8	0.4	0.052 47±0.000 84	0.359 06±0.005 78	0.049 53±0.000 44	311.5±4.3		311.6±2.7
IIML84-10	128.0	258.8	14.4	0.5	0.051 91±0.000 95	0.353 38±0.006 78	0.049 26±0.000 46	307.3±5.1		310.0±2.8
IIML84-11	82.0	218.6	11.9	0.4	0.051 57±0.001 11	0.354 71±0.007 14	0.049 98±0.000 47	308.3±5.4		314.4±2.9
IIML84-12	129.7	288.8	15.7	0.4	0.056 18±0.001 12	0.381 73±0.007 61	0.049 27±0.000 53	328.3±5.6		310.0±3.3
IIML84-13	151.4	257.0	14.9	0.6	0.051 03±0.001 10	0.355 94±0.007 21	0.050 65±0.000 48	309.2±5.4		318.5±3.0
IIML84-14	90.5	236.9	12.9	0.4	0.053 07±0.001 07	0.360 40±0.007 05	0.049 20±0.000 46	312.5±5.3		309.6±2.8
IIML84-15	65.3	204.2	10.9	0.3	0.050 91±0.001 16	0.351 04±0.007 85	0.050 02±0.000 52	305.5±5.9		314.6±3.2
IIML84-16	202.4	358.3	20.4	0.6	0.051 58±0.000 92	0.351 25±0.005 83	0.049 42±0.000 43	305.7±4.4		311.0±2.6
IIML84-17	89.0	207.3	11.2	0.4	0.052 10±0.001 22	0.349 51±0.008 04	0.048 64±0.000 45	304.4±6.1		306.2±2.8
IIML84-18	73.0	164.8	9.2	0.4	0.050 32±0.001 26	0.338 51±0.008 41	0.048 81±0.000 51	296.0±6.4		307.2±3.2
IIML84-19	117.1	261.9	14.6	0.4	0.051 50±0.001 08	0.354 10±0.007 33	0.049 88±0.000 48	307.8±5.5		313.8±3.0
IIML84-20	94.8	230.6	12.9	0.4	0.052 30±0.001 20	0.362 69±0.008 44	0.050 26±0.000 45	314.2±6.3		316.1±2.8

Table 1 LA-ICP-MS zircon U-Pb data of the diorite porphyrite in Shazhangtu mining area

分析点	元素含量/10^-6			Th/U	同位素比值				年龄/Ma
分析点	Th	U	Pb	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb/²³⁸U ±1σ
IIML84-01	129.2	273.9	15.2	0.5	0.051 77±0.000 98	0.350 94±0.007 07	0.049 11±0.000 44	305.4±5.3		309.1±2.7
IIML84-02	144.6	315.6	17.5	0.5	0.051 50±0.000 95	0.351 99±0.006 33	0.049 61±0.000 39	306.2±4.8		312.1±2.4
IIML84-03	89.2	235.4	13.0	0.4	0.052 32±0.001 06	0.360 82±0.007 16	0.050 03±0.000 40	312.8±5.3		314.7±2.5
IIML84-04	176.7	435.4	24.1	0.4	0.051 10±0.000 83	0.356 33±0.006 15	0.050 52±0.000 50	309.5±4.6		317.7± 3.1
IIML84-05	61.2	159.6	8.8	0.4	0.051 56±0.001 13	0.357 30±0.007 72	0.050 33±0.000 52	310.2±5.8		316.5±3.2
IIML84-06	117.0	258.2	14.1	0.5	0.053 68±0.001 16	0.364 53±0.008 06	0.049 22±0.000 50	315.6±6.0		309.7±3.1
IIML84-07	93.3	233.7	12.8	0.4	0.052 49±0.001 10	0.363 94±0.007 20	0.050 36±0.000 51	315.2±5.4		316.7±3.1
IIML84-08	167.1	315.5	17.7	0.5	0.052 90±0.000 93	0.361 05±0.006 33	0.049 38±0.000 42	313.0±4.7		310.7±2.6
IIML84-09	122.5	313.0	16.8	0.4	0.052 47±0.000 84	0.359 06±0.005 78	0.049 53±0.000 44	311.5±4.3		311.6±2.7
IIML84-10	128.0	258.8	14.4	0.5	0.051 91±0.000 95	0.353 38±0.006 78	0.049 26±0.000 46	307.3±5.1		310.0±2.8
IIML84-11	82.0	218.6	11.9	0.4	0.051 57±0.001 11	0.354 71±0.007 14	0.049 98±0.000 47	308.3±5.4		314.4±2.9
IIML84-12	129.7	288.8	15.7	0.4	0.056 18±0.001 12	0.381 73±0.007 61	0.049 27±0.000 53	328.3±5.6		310.0±3.3
IIML84-13	151.4	257.0	14.9	0.6	0.051 03±0.001 10	0.355 94±0.007 21	0.050 65±0.000 48	309.2±5.4		318.5±3.0
IIML84-14	90.5	236.9	12.9	0.4	0.053 07±0.001 07	0.360 40±0.007 05	0.049 20±0.000 46	312.5±5.3		309.6±2.8
IIML84-15	65.3	204.2	10.9	0.3	0.050 91±0.001 16	0.351 04±0.007 85	0.050 02±0.000 52	305.5±5.9		314.6±3.2
IIML84-16	202.4	358.3	20.4	0.6	0.051 58±0.000 92	0.351 25±0.005 83	0.049 42±0.000 43	305.7±4.4		311.0±2.6
IIML84-17	89.0	207.3	11.2	0.4	0.052 10±0.001 22	0.349 51±0.008 04	0.048 64±0.000 45	304.4±6.1		306.2±2.8
IIML84-18	73.0	164.8	9.2	0.4	0.050 32±0.001 26	0.338 51±0.008 41	0.048 81±0.000 51	296.0±6.4		307.2±3.2
IIML84-19	117.1	261.9	14.6	0.4	0.051 50±0.001 08	0.354 10±0.007 33	0.049 88±0.000 48	307.8±5.5		313.8±3.0
IIML84-20	94.8	230.6	12.9	0.4	0.052 30±0.001 20	0.362 69±0.008 44	0.050 26±0.000 45	314.2±6.3		316.1±2.8

Fig.3 Zircon CL images and ages of diorite porphyrite sample in Shazhangtu mining area

Fig.4 Zircon U-Pb concordia (a) and 206Pb/238U weighted average age diagrams (b) of the diorite porphyrite in Shazhangtu mining area

Table 2 Major elements (%) analysis results of the diorite porphyrite in Shazhangtu mining area

样号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	A/CNK	A/NK	AR	σ
IIML42	60.45	0.87	16.64	9.04	0.06	1.92	2.52	2.29	3.01	0.29	2.47	99.56	1.43	2.37	1.63	1.55
IIML84	56.52	1.02	16.85	9.09	0.12	3.58	4.45	2.72	3.01	0.29	1.90	99.55	1.06	2.18	1.69	2.31
IIML88	56.19	1.03	17.31	9.46	0.13	3.32	4.68	2.54	2.43	0.31	2.57	99.97	1.13	2.54	1.58	1.77
IIML89	56.24	0.97	17.01	9.42	0.12	3.38	5.26	2.74	1.94	0.28	2.36	99.72	1.05	2.57	1.53	1.56
IIML90	56.96	1.01	16.81	8.37	0.15	3.54	5.22	2.85	2.48	0.26	1.79	99.44	1.00	2.28	1.64	1.94

Fig.5 Rock type diagrams of the diorite porphyrite in Shazhangtu mining area

Table 3 Rare earth element (10-6) and trace element (10-6) data of the diorite porphyrite in Shazhangtu mining area

样品编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm
IIML42	28.94	59.11	6.97	28.29	6.29	1.24	5.83	0.92	5.43	0.97	2.82	0.45
IIML84	24.30	53.91	6.76	29.17	6.31	1.95	5.79	0.94	5.51	1.09	3.10	0.44
IIML88	25.16	51.97	6.60	28.19	6.22	1.91	6.04	0.95	5.38	1.00	2.73	0.41
IIML89	25.65	55.21	6.98	28.86	6.32	1.80	5.56	0.85	5.10	1.01	2.88	0.42
IIML90	26.11	55.20	6.83	29.39	6.76	1.87	6.26	1.01	5.64	1.04	2.89	0.43
样品编号	Yb	Lu	Y	REE	LREE	HREE	LREE/ HREE	(La/Yb)_N	(La/Sm)_N	(Gd/Lu)_N	δEu	δCe
IIML42	2.98	0.43	31.50	150.67	130.85	19.82	6.60	6.96	2.97	1.69	0.63	1.02
IIML84	2.93	0.42	30.42	142.62	122.40	20.22	6.05	5.95	2.49	1.71	0.98	1.03
IIML88	2.67	0.39	29.98	139.62	120.04	19.58	6.13	6.75	2.61	1.93	0.95	0.99
IIML89	2.89	0.43	28.89	143.94	124.80	19.14	6.52	6.37	2.62	1.60	0.93	1.01
IIML90	2.91	0.41	31.12	146.75	126.16	20.59	6.13	6.44	2.49	1.88	0.88	1.01
样品编号	Rb	Ba	Th	U	K	Ta	Nb	Sr	P	Zr	Hf	Ti
IIML42	288.25	341.70	9.35	2.23	25 741.60	0.80	11.35	209.49	1 310.70	219.10	5.61	5 376.90
IIML84	210.93	310.53	7.09	2.04	25 588.81	0.84	10.99	478.30	1 294.78	282.57	6.39	6 261.00
IIML88	144.13	281.42	6.57	2.24	20 711.10	0.74	10.36	388.47	1 387.63	270.59	6.39	6 338.61
IIML89	92.83	292.51	7.46	1.97	16 541.58	0.78	10.9	459.31	1 253.86	285.18	6.70	5 971.83
IIML90	139.32	373.38	7.10	1.92	21 083.14	0.82	11.37	487.04	1 160.84	296.11	6.61	6 199.62

Fig.6 Chondrite-normalized REE patterns (a) and primitive mantle-normalized multi-element spider diagram (b) of the diorite porphyrite in Shazhangtu mining area(chondrite normalizing values after reference [25] and primitive mantle-normalizing values after reference [26])

Table 4 LA-ICP-MS zircon Hf isotope data of the diorite porphyrite in Shazhangtu mining area

测点号	T/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf ±2σ	¹⁷⁶Hf/¹⁷⁷Hf	ε_Hf(0)	ε_Hf(t)	T_DM/Ma	$T D M C$ /Ma	f_Lu/Hf
IIML84-1	309.1	0.046 1	0.001 2	0.282 720±0.000 024	0.282 713	-1.8	4.7	758	1 024	-0.96
IIML84-2	312.1	0.039 7	0.001 0	0.282 677±0.000 021	0.282 672	-3.3	3.3	814	1 115	-0.97
IIML84-5	316.5	0.026 6	0.000 8	0.282 705±0.000 025	0.282 701	-2.4	4.4	771	1 047	-0.98
IIML84-6	309.7	0.073 3	0.002 0	0.282 660±0.000 025	0.282 649	-3.9	2.5	861	1 168	-0.94
IIML84-7	316.7	0.075 8	0.002 0	0.282 731±0.000 031	0.282 719	-1.5	5.1	758	1 005	-0.94
IIML84-8	310.7	0.050 4	0.001 4	0.282 807±0.000 025	0.282 799	1.2	7.8	637	827	-0.96
IIML84-11	314.4	0.036 6	0.000 9	0.282 686±0.000 022	0.282 681	-3.0	3.7	801	1 093	-0.97
IIML84-12	310.0	0.080 6	0.002 0	0.282 771±0.000 028	0.282 759	0.0	6.4	701	9 8	-0.94
IIML84-15	314.6	0.034 8	0.001 0	0.282 613±0.000 022	0.282 607	-5.6	1.1	905	1 259	-0.97
IIML84-16	311.0	0.052 1	0.001 3	0.282 703±0.000 027	0.282 696	-2.4	4.1	784	1 061	-0.96
IIML84-19	313.8	0.056 6	0.001 4	0.282 785±0.000 028	0.282 777	0.5	7.1	669	876	-0.96

Table 4 LA-ICP-MS zircon Hf isotope data of the diorite porphyrite in Shazhangtu mining area

测点号	T/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf ±2σ	¹⁷⁶Hf/¹⁷⁷Hf	ε_Hf(0)	ε_Hf(t)	T_DM/Ma	$T D M C$ /Ma	f_Lu/Hf
IIML84-1	309.1	0.046 1	0.001 2	0.282 720±0.000 024	0.282 713	-1.8	4.7	758	1 024	-0.96
IIML84-2	312.1	0.039 7	0.001 0	0.282 677±0.000 021	0.282 672	-3.3	3.3	814	1 115	-0.97
IIML84-5	316.5	0.026 6	0.000 8	0.282 705±0.000 025	0.282 701	-2.4	4.4	771	1 047	-0.98
IIML84-6	309.7	0.073 3	0.002 0	0.282 660±0.000 025	0.282 649	-3.9	2.5	861	1 168	-0.94
IIML84-7	316.7	0.075 8	0.002 0	0.282 731±0.000 031	0.282 719	-1.5	5.1	758	1 005	-0.94
IIML84-8	310.7	0.050 4	0.001 4	0.282 807±0.000 025	0.282 799	1.2	7.8	637	827	-0.96
IIML84-11	314.4	0.036 6	0.000 9	0.282 686±0.000 022	0.282 681	-3.0	3.7	801	1 093	-0.97
IIML84-12	310.0	0.080 6	0.002 0	0.282 771±0.000 028	0.282 759	0.0	6.4	701	9 8	-0.94
IIML84-15	314.6	0.034 8	0.001 0	0.282 613±0.000 022	0.282 607	-5.6	1.1	905	1 259	-0.97
IIML84-16	311.0	0.052 1	0.001 3	0.282 703±0.000 027	0.282 696	-2.4	4.1	784	1 061	-0.96
IIML84-19	313.8	0.056 6	0.001 4	0.282 785±0.000 028	0.282 777	0.5	7.1	669	876	-0.96

Fig.7 Zircon εHf(t)-t (a) and 176Hf/177Hf-t (b) diagrams of the diorite porphyrite in Shazhangtu mining area (base map according to reference [32])

Fig.8 Y-Sr/Y diagram ((a),base map according to reference [42]) and Ba/La-Th/Yb diagram ((b),base map according to reference [43]) of the diorite porphyry in Shazhangtu mining area

Fig.9 Rb/Y-Nb/Y diagram and Nb/Zr-Th/Zr diagram of the diorite porphyry in Shazhangt mining area (base map according to reference [48])

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